uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/development/python-modules/py-eth-sig-utils/default.nix

@@ -0,0 +1,41 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, eth-abi
+, py-ecc
+, pycryptodome
+, python
+, rlp
+}:
+
+buildPythonPackage rec {
+  pname = "py-eth-sig-utils";
+  version = "0.4.0";
+
+  src = fetchFromGitHub {
+    owner = "rmeissner";
+    repo = "py-eth-sig-utils";
+    rev = "v${version}";
+    sha256 = "sha256-PNvEHH5w2ptntRGzqWrqlbIzJJsT60OXg/Dh5f6Wq9k=";
+  };
+
+  propagatedBuildInputs = [
+    eth-abi
+    py-ecc
+    pycryptodome
+    rlp
+  ];
+
+  checkPhase = ''
+    ${python.interpreter} -m unittest
+  '';
+
+  pythonImportsCheck = [ "py_eth_sig_utils" ];
+
+  meta = with lib; {
+    description = "Collection of functions to generate hashes for signing on Ethereum";
+    homepage = "https://github.com/rmeissner/py-eth-sig-utils";
+    license = licenses.mit;
+    maintainers = with maintainers; [ SuperSandro2000 ];
+  };
+}